- eastern domain
- echolocation
- Ecological species concept
- ecologist
- ecology
- Ecophenotypy
- ecosystem
- ectoderm
- ectoparasite
- ectotherms
- edentate
- education
- egg
- electrophoresis
- elongate
- emarginate
- embayment
- embryo
- endangered
- endemic
- Endemic species
- endocrine
- endoderm
- endoparasitic
- entocone
- entomologist
- entomology
- Eocene
- eosinophil
- epidermal
- epidermis
- epididymis
- Epipelagic
- Error
- erythrocyte
- estuary
- ethmoid
- ethology
- Eucalyptus
- eukaryote
- Euphorbia
- eusocial
- evolution
- Evolutionary classification
- Evolutionary systematics
- extant
- extinct
- Extinct in the wild
- extirpate
- extralimital
- exudate